When disabling TLS 1.0 some functionality does not work, including esync.
Version 9.2 also has this fix so you can go directly to that version instead of 9.1SP3. For XSLT use 9.2 may be required if https is used.
Engineering has added this fix in 9.1 SP3. Please upgrade to this version to benefit from this change. Support also has a fix for 9.1 SP2. Currently these are the only two versions that will have this fix. We are investigating adding this to 9.0 SP3 as well. Please contact us if you would like to implement the changes in 9.1 SP2.
Episerver is aware of potential compatibility issues with the Ektron platform supporting configurations without TLS 1.0 enabled on the web server. The issues appear to be with the Ektron Windows Service and more specifically; the eSync certificate read operations. At this time, the Ektron platform requires that TLS 1.0 remains enabled on all systems running an Ektron site. As we understand that this is an important configuration to support for our clients we are treating this with high-priority and will notify all clients via updates to this article on the customer portal of any solutions or progress towards the same. We additionally urge all customers seeking this configuration to prepare with all of the needed Microsoft updates including service packs and possible hotfixes to address any existing potential issues with Microsoft .NET, Microsoft SQL Server, and Microsoft IIS.